| 黄丽华,施清泉.混凝土开裂对BFRP混凝土界面应力的影响[J].,2018,58(5):505-510 |
| 混凝土开裂对BFRP混凝土界面应力的影响 |
| Effect of concrete cracking on interfacial stress between BFRP and concrete |
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| DOI：10.7511/dllgxb201805010 |
| 中文关键词: 扩展有限元 裂缝扩展 钢筋混凝土梁 玄武岩纤维布(BFRP) 预损伤 |
| 英文关键词: extended finite element crack propagation reinforced concrete beam basalt fiber reinforced polymer (BFRP) pre-damage |
| 基金项目:国家自然科学基金资助项目(51378089)；辽宁省自然科学基金资助项目(2014020008). |
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| 中文摘要: |
| 以最大主拉应力作为混凝土开裂的判别依据，采用基于能量的指数型软化损伤模型，利用扩展有限元模拟钢筋混凝土梁的裂缝扩展过程．通过在试验梁裂缝位置处预设初始裂缝，对比不同荷载水平下的裂缝扩展高度，得到与试验梁基本一致的裂缝扩展结果．进一步将该方法用于玄武岩纤维布(BFRP)加固预损伤钢筋混凝土试验梁的失效分析中，模拟了试验梁由于混凝土裂缝扩展引起的界面剥离全过程，给出了混凝土裂缝扩展与界面应力分布之间的对应关系，得到混凝土开裂是导致BFRP剥离的主要原因的结论． |
| 英文摘要: |
| Taking the maximum principal tensile stress as the criterion of concrete cracking, the exponential softening damage model based on energy is applied to simulate the crack propagation process of reinforced concrete beams by extended finite element method. The initial crack is preset at the crack position of the experimental beam, and the crack growth heights under different load levels are compared, and the result of crack growth is basically consistent with that of the experimental beam. The method is then used in the failure analysis of pre-damaged beam reinforced with basalt fiber reinforced polymer (BFRP) to simulate the whole process of interfacial debonding induced by concrete crack propagation, and the correspondence between the crack propagation and the interfacial stress distribution is given. It is concluded that the cracking of concrete is the main cause of BFRP peeling. |
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